1) You have to take Organic Chemistry I/II prior to joining any PharmD program
2) If the aim is getting a B.S. in Biology or Chemistry you'll have more than enough upper science courses
3) If the aim is 2-year prerequisites (minimum), keep in mind a majority get accepted with majority getting there PharmD (NAPLEX is another discussion)
Prior to eventually going the pharmacy route, I decided to get a degree in biochemistry in preparation to meeting all didactic requirements for many heath professional programs (medical, dental, physician assistant, assistant anesthesiologist, physical therapy, etc). It just opened up a lot more doors while feeling confident enough that, at the least, I took just as many upper science courses as most others.
Of course, if you're dead set on pharmacy, it really doesn't make sense to go beyond the minimum requirements. If you want to see if you can handle professional schooling, go work as a pharmacy technician while doing your undergrad courses. If your can work and manage your classes, you'll be set.